Identification of dragonflies (Odonata)

Today I visited the Moscow Botanical Garden. Somehow I didn't even recognize it! There used to be so many animals, but now it's empty. Yes, and for dragonflies somehow not very. Sympetrum vulgatum, sanguineum, flaveolum, danae. Aeshna cyanea and Aeshna grandis were once encountered. I remember there were a lot of them, along with the watchers and the Orthetrum cancellatum. And now it's almost zero. Of the equal-winged ones, only Erythromma najas and lyutki, which, in fact, I lay out for definition. Thank you in advance!

Chuvashia, 30.7.2016, Sympetrum sanguineum?

Hello, please help me determine.
26.07.2016 Chernivtsi region

Today, on one tip, I visited the area of the Moskva River near Nizhni Mnevniki Street. I was satisfied with the result: a wide variety of dragonfly species, and there are quite unusual ones.
1-3. Ischnura elegans?
4. - ?
5. Can it be a Sympetrum striolatum?
6. Is Libellula fulva really in Moscow in person?
Thank you in advance!

Is this also Enallagma cyathigerum? In the same place.

Colleagues
Is it Sympecma paedisca or S. fusca?
Yaroslavl region, south, marsh
Pronotum coloration

Tip of the abdomen

  S. paedisca

Thank you very much! I was confused by the shape of the back edge of the green stripe with an implicit protrusion...

I understand. But in S. paedisca, this also happens.

Good afternoon! Chalcolestes viridis or C. parvidens? Chernivtsi region, 8.08.2016

IMHO Ch. viridis. It is a pity that the photo of the appendages on the side is not very clear and not quite lateral. Is it possible-if the dragonfly is assembled - to make it larger and more accurate from the side?

In any case, as I understand it, the find has a certain interest.

Please help me with three copies of Aeshna caught in swamps 100 km north of Moscow today. I'm thinking of something like Aeschna juncea or Aeshna subarctica. Or maybe there are both species present, or someone else. In general, I would like to get acquainted with the exact signs of determining this color in dragonflies. Thank you in advance!

Do you know any works on this topic or someone who can tell you? I have some problems with preserving the color, so for now I keep them in the freezer, where they are always fresh.

I expected to see a large variety of Sympetrum, but so far only these same-type dragonflies, presumably Sympetrum fonscolombii, are flying in the mass?

Colleagues
A dragonfly was caught on 11.8.16 in a swamp in the south of the Yaroslavl region (not by me). Because of ethyl acetate faded... I assume that this is a representative of the sem. Corduliidae and possibly Somatochlora. But I can't seem to get out

   Orthetrum cancellatum, female

Yes... I was so fucked up....
And this is Chalcolestes viridis?

Unlikely. I don't know what kind of view it is yet. Give it to me, please: 1) side view of the breast; 2) general view; 3) "tail" on top and bottom; 4) label.

label : Yaroslavl region, Pereslavl district, Bludovo boloto (2 km . south of the village. Kupanskoe) 10-11. 8. 2016
Of course we can assume that this is virens, but where are the yellow spots on the head???

It is L. virens, a young male. There are spots on the back of the head. You can see them no matter-imho because the head is strongly bent back.

What is meant by spots is the yellow stripe (marked with arrows)?

After wandering around the steppe for a while, I somehow managed to track down a single instance of Sympetrum, which differs from the huge number of Sympetrum fonscolombii. I assume meridionale. Further, in the same way accidentally stumbled upon a female arrow (Ischnura pumilio)?

2 more dragonflies from the local pond.